byBritish Broadcasting Corporation. Television Service; Time-Life Films
The Crab Nebula Contrasts and compares the effect of two kinds of dam-building -- that done by beavers, and that done by human engineers. Points out how man is damaging the ecological balance of nature whereas the beaver is not. Topics: Astronomy., Solar system.
byBritish Broadcasting Corporation. Television Service
For the first time, man is able to see in sharp detail the surfaces of the Moon, Mercury, and Mars. By reading into their surfaces the history of how the planets formed, scientists are attempting to discover the origin of the solar system itself Topics: Planets, Lunar surface, Origin of the Solar system, Planets, Surface of Mars (Planet), Surface of...